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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c675440c8bf83bdd33edad3ea6585fc1b8dbfdad78107d101aeb3af8daf187fa' 
  AND token = 'tn5F31PRDhmXmhl2xqIoCm4U7/kC4GJPVbEgzSsORNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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