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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b27d5692fccfe02bd3a8b35b645474af1b16434aac8f0fd71e8a13e7fd8977d' 
  AND token = '6bq619Q5s3eKeM90QSW8qf0Q1LrFm9bDUrNFXnqYDIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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