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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a3f6e5d3c1505663af2642652becbe6ad4a974f7d16890674990d1acc7e206' 
  AND token = 'lanvQOLZ5lQx9+I4C+EJaj0tajboRcy7WUiAdKnQcxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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