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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526e68ad148693fcbdaccaea9a0f664aca03ac8372aeaee0f664274228e9fd9b' 
  AND token = 'QPO+XIlIof05c0gbSJJ/QIwC+zr3HbW4aRSn68UqjRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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