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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfa9ae59ca1d07ceab6557717396912de5bb8e29ad48598c743b20b4665182d' 
  AND token = 'L0c91vQEhGyjsEFOs5v1CJ2BGhtddQ0W36/RQ0LQ7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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