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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a639c2cb6ae97433c8f04f79cff619a9cfb6d17d3a27efbe6492cf1ed4139f' 
  AND token = 'Qp8TPkARdAD3zGOK/PmGlDYFGXNTcIAmCzFOO67/98g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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