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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f02547a58b90c49ac82cbd5921a81b43dbe5ca0628cdc4334bc8563ce2f02c' 
  AND token = '0OhpcwIHWDQ5OJk1BdKZqFXoKcYSHSdMM4YWPy95izc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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