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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311ea45da2742f50edb9e7fb08b1c3336f70886cba2b019d3c6c67ff68996296' 
  AND token = 'llx+djIx4KNKAdmKp973XvmeAX7oGiP9yvS5gFtMCGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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