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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4361dc32bed70411a189f63490b0a9759bbf3609ab739aee44387455f01806' 
  AND token = 'CiW4VG41heFzP/QcK6PUONLj4G9H7ubGYgXSN7eopIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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