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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9d2ce8e5203b1ed4f69a1b65324656a7dd9ec368a80c2a9539569b397c7650' 
  AND token = '0dh76bgfxSuBSzcCrjSmt0cDNBBkNq8xiN3U2+mBR6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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