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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6839141856e967c542b6c7255d4a79d7d06a716d7e7c4b849f855c1cae1c5d85' 
  AND token = '6VX5ljcJR8l5hsrQl2yLabkWqBS+htT1+INI1ILvJBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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