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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c3ca81ee549ae0bc38f9c3c8dda783e96ac9499df727d6df65016fa912ff6b' 
  AND token = 'Jeogeht7YgZLTpv2b8o9GnKaTKMSllS+64J7Plw1yyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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