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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a405151296acffa946831259c2405adf2242648b6e24a869bf2a1636b65ee86b' 
  AND token = 'rau4Xd5rOpMf+hbDH093zytCLAQMVvoOllk4a9jSqdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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