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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213104a23ba1ead400089d563e79bcc1177b0b54d65c9a3d8d0688c122d6c5fc' 
  AND token = 'lYuIIErBWl+H9h1ad43xS7dgYh4EZ6EPPmwg/o6eowA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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