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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd88f9cc94baae29e344c042f01b8864153a75d5332e951fde46e1fd5c273009' 
  AND token = 'tO4PauXv719wqPlYkvfbbYPdgmJFzsBN4les1WCnvpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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