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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001a598805b1830ca6d8349887347400087d88c48b58da4b7dae1b0eee788df4' 
  AND token = 'jJy+5BLep23Tx2JRa8FtJT2JTwYgF8ho1r1gk8P17xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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