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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8903670878d1402f2121e851139c9157da54f890d97954839fffe1f97a697e2f' 
  AND token = 'qfmosaBSbVvALZT2CrD9oGNIx/eaqw94YRHPajbwj3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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