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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23275efade924212ae9d2c0766c3d076a7dbf74bd94acc9f41553344b526d127' 
  AND token = 'ldFQR+DZhtBHef5thrQ1TZXLbCmNJNn0Sr5tVmfQ7S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}