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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a80391ee77d3e2cbab76a982a3779aeae55af104f86bd5750f609e962bd44f' 
  AND token = 'HVGT/4KfGr95b3hPl5rY0K6Gjbor53MWkpzl0xP1jms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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