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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc3890924029fe489645886bdac4ab59734060ab7756ccea401725824d2a0b2' 
  AND token = 'uCmc0Te13JoTsk4rb/28cOU6kvDA4yXIKUsZy3ItTzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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