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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a5c3eec1a4bf057b067f358c3d98b1930250eaa3c4260e196cd9b0c1031db3' 
  AND token = '2J7yqRBEkSTmNKHCU62uEx8ssrExEk37SCnNiFz2Jog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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