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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccee490f89ba31de66b1d2984f1d22a40390442ef8c156d01bb6aecc7015dafa' 
  AND token = 'h+nsOfmEpCV09bh66cDrpGHze557aMEGPpH2uXQOUwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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