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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e851581a01206a9d31487b8b016e6c60fdf5a2a96e20b23ebed0daf633098af' 
  AND token = 'VKAtInlpq3kq8b0SZQrWN/TYxGufxH291BWuz3fBsD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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