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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04de4547ae53f57b78fba33b4ba554976255bad4d6a572f5b8c2ccbcff9f241' 
  AND token = 'a/s5gNZc/9/Z0/fgDGqHS6QHywRk3Th3gn1yffl0AvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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