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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232112f462c68be7ed1f0be40005cfe00ba762f41a1b4dc61c94ed981636986b' 
  AND token = 'G6ZOYas+OHdS0R9v3nV42qJ65to/VQIJ87/t75AITT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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