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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67c02315dd005dae1c1224a1e304b605670278469bb3aae34d13d71778267e3' 
  AND token = 'l9Kjy/uT8nOSh/kEYVHdDH5j89VMLJP35qhyQtJwE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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