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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a827d935f6b0e68dcfd20c9ff36424a2a19666485eea45c050fd3a49d3ddbc' 
  AND token = 'EdrBOSBHj5HiWCh2G3EAQjJynwdrb9CO0VzWMEwTJrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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