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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c3ea9bacb730a50c8b140fbd3bf310131811668c182fba3745ae98ef291aff' 
  AND token = 'ZzCtmalv71HLL+NyB3aqYE79HCl5ses6ukVyTUUY5Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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