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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77c04c0b0aab8abe68908bb799a81796ca47b2dddb6d9974061e3a7c6446b96' 
  AND token = 'xqmzkq+F0KoAD+XkQYIkFVfxW29/XjtJ62ClbdN/ACc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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