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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7491911c11858708acee48377df096b5a05c8ee61c76b3e1ba95dd7f75429f5' 
  AND token = 'g83IqAy1a98mwqERzYJJvwrUrbOYxvkx2gVNHU98bpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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