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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0953b28176b1ec94cd851e60cf61ad702fed77d046a5abe1ad9140828fdb6b7' 
  AND token = 'LzFRwUmS2Cf0KCfI2ujYABRL3p2vnlb5yIr6cd7CbdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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