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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc528b0ebbd5db9c37d1e755868c4bb1e6dd960b830738ef2aacd368fc356dbd' 
  AND token = 'bSCtC77Wx6cRUeKafkd6kuCWLWN0jOh+wSsbZQQSVYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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