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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809eea790c6dbe378191b50ff55bb5d1f1e2ede9ecf213ece9df8f091c548e26' 
  AND token = 'Ma2a0I7yqVszFkl8k5H7ZvQ7hfSt56Z2INwSaydmpTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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