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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e692cc9c06d321eecc07a16cc66d3bef3a5aaf67ff38f852b9b9783481213a8c' 
  AND token = 'aCTWjB3NQBUH5HSoJ77uiKkncK9CIEyrSlW0SSBCYCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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