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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1aa5a34024fdfa65bc45964f239140aaf1f0f710bde2ba033cac8a3a59265ec' 
  AND token = 'Ez1dVyB18BtUTXdsJTdCHruplle1shbO3yAehJeYGsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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