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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d076559c9c132d093a58762bdf7b68da19382e3eea65bd41802a6da71230faf' 
  AND token = 'zpQ+423EJX5/rz9o6v4X6gfQTzbUQJ9Z3e/A+Hfh7iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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