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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301fd7e4038aaaa7d0c1d35fdf26f62de03ec30856de52c07da628e2c46444df' 
  AND token = 'EqhJhX1Sin0YIyIFuVNJrGWdh1ksikqWSR3dpRaiUtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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