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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c907d2600a9c0bd1f863a518188ed374d3dbf578dabe1d93450e38e7fd9555d' 
  AND token = 'GQ9iNzMwig3eS1cPXmWfU8AaL+7lI7GqUoj2glx4uVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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