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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce1911da1b3361443649b5a11940b735a8d60b05c02a644eebb15e8ac734fb8' 
  AND token = 'g+3w3BSJcy6NECeogPxKrbvzvvCgLt+zecdIioGt4nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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