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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0891439c231117c33c7a8dd92ce4c265877f38bc85b1b683bc4dc42d0d601c' 
  AND token = 'Nas0M4u3WurQHa9S393/9SZGVg/fv3gNB95Ggdyc4eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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