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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910dc13bea46e0ebc5399cea78472fb5a827d97d8e6b32ea14b844383fbfb882' 
  AND token = 'TwElv/GzRinr6S+/1Ui2N1RAviE9pM43WMg795QsMzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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