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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd717909743c34a28badadafa59a5ab9658d1cc1a7fc9679c47e774c8ebc4464' 
  AND token = 't47fUoLQFKtioI7PZmXesEpXELoIYxaRsLJa41nrl2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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