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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db3ce2044d69ba1a620c2ee03de98adc09128776c40a804ad0f9353502ea41e' 
  AND token = 'r5JfcBgw7h3Squ8IYAan+QTOIpybM9lRKBde8h5Pwy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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