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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272cc24d2806d2fd697bd091cddbbe16e64d893c69a9fed5070d0cca1022147c' 
  AND token = 'O5PK1ieHS9aOo6YYPtFP4tou8QeJ+7yK+Eqy/gqBx/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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