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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76648d01fda338c3c686513fbf262e87b79ba0040f2641117fb1ce8b7b98fc8f' 
  AND token = 'mG/cQ5vswgzmvu2OdYhYs5y7HSL86Iku7fFkUfa1K1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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