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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97ddfe38df536cbea83936cc2c8483c3f5a25b34fee59b62fe25fa5ab2e210b' 
  AND token = 'HrrnP0Np/nujzj3RfcPQvsAqREQgiQ9ADV7CzyDg4yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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