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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e1f8c87192c6052c4f018e105acb76a2f623ef5f056d38bd7d56baa1b3c30d' 
  AND token = 'rgH1gZhuj9eal85QlxMTrNWVoViEWjzkm7fGn8bCVBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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