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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8006615c2b90c5fbedc0fdd07569436ea154a12db631af8a6d2bb58c4b6260d4' 
  AND token = 'zypl7R5xkgUZMqXFKgvJZobMytp1ww1LtbiBRmsHQmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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