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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc67527d50fc02e166f9312c525f5af0749f8b5805107ba46d6a8eedcff0fe5' 
  AND token = 'AyRoZK40sUqpk18GZrZ9bP8xM89WZUX/ZG6LcqldRXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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