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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daff03f481593f17f8a1052f370e94bcc994d530a7847f60f88a981352bac554' 
  AND token = '3lEbBNLLTVo0Q8b/UYy4sE4LaqNGpR9lvFbsZPjzNg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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