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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8fae8f0ca6c18da1dbea0ccc666e68bb2f0d1db9f92562437cda73205f5e7c' 
  AND token = 'DLi1cAN73/ps5JxX91VyBeSVsdKzSOcpmlqd2CEEiNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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