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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38671054c144446b2af7dd72d988798a21628a2c7cf7946dc774d67dff06375c' 
  AND token = 'VZunVW2PSPUhg7awzfs7qdeguVyPG1nToUvlgl8m1pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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