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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b1c67d451e0517789d63f248b799c37944cf887151fafaeca76151d40eb563' 
  AND token = 'eCbVwd72oH2pZD0SVuDg2cXbMBvDUXKxF2bdeTwe3lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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