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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e973b2f42e92e5fd818b9a2818eaa2f2f77acc1574f9738080ae3fe23d00158' 
  AND token = 'vMd8Vw8xAhxYwoXf2Q2UHZ6jh9PsFWDk5Dg4QMW94gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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