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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d76daebcc5c044cb4b8a4e8bf4e5c26b37acaabe2bba62faaaf7d599c9b8dab' 
  AND token = 'gQdu3+NIYRKRsy/2KKO6aG1OC9Fx+ASCN8SAWPBxs40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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