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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d328651bee5c7662664e09d5baaeaa3c7df389f2f0fe41500feb1d06161f6bd' 
  AND token = 'AWaa+IxFpFdpGZfncupIfWFkP5Atb6vCHqDp4jxmg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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