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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c328e072beb8ccf67b6e3152f3a43e4cef3308a1e80066b9a2d89fe59e7f7a4' 
  AND token = 'RzJPQ5gfEtgtAmRXNg4v4xH7rZYhaOx7cJNHl/+rlVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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