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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da31032c7604df0f6900fe4693fc62cd10a8531f3fb9873734702f1ddb08a034' 
  AND token = 'ZVFGygzDN3ZwEzHI7TslNXDlU/K/zWn/K9fSfhzW/4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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