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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0366558f4585fd93b83defe0e9bc18c8bdcd1f4d7c15a697bdbb77a16ada6d4' 
  AND token = 'ZNsdyQcSq1Zt9uX3tP94BXgXbUGLfn+7Qz6YT2GoX70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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