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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafec775e2b1fee74e1479bd2aa6b2d5e6efa96cf9ef5fbe4c7e3b331a140084' 
  AND token = 'gmIEBlAbjLXuoiWtrMbLS8zG4295aXS2mQt7FiSAg7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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