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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb8e2333d6cab2a7418180928fb46fe92f982747455b4730b7b1e1c822d7f25' 
  AND token = 'ySMdy/JJtwSCv79/7g//2Nakql3wnf8XzrQshbLl/dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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