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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fdba5c7d04cd9dd0d0b81c73f46f8b1694d8b029e374534fbc0788a2ed06cd' 
  AND token = 'Gpbh2fQpQLD3o+mB0YYfOEG7m+BseMnx0p2TZ+ceC9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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