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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6688e8dcb706f6b57c4407e674cf54159a6056a6fcbd9d3e7738bdb3a9bd0911' 
  AND token = 'y3H5GcdDvoZ5bYAL/I13ryJZLzTjQ2nfxsTBkEufZ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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