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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173929c62132d5f57d0053785834d0abcd6de8a9d134d6fbed94ad121e1b3d2b' 
  AND token = 'v1uxKBLwT5LWmvCGuHc8yg6II61Afh2osEkLgU1S7zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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