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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8648b88ccb8acdef0773681daf39cfb065f7b71c8924cc67765baba369bfec' 
  AND token = 'WtSIkGxDShuLJXEHlEzR7NsTh1boAkt2ABS4A8Opb0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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