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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fefb51033e88ac10899e7b84e31199dc86d2a03321a9ed8f21b3f3fea86a241' 
  AND token = 'q7RSRqQws6a5azIAyveSgs+eX0rupjoV4HurmC8Cwm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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