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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5551daa4df9b483242363db60cdda38b0bb1a25f6d564601b3fe99d3457488f1' 
  AND token = 'fJiblWMIOFsHkFEu0GKNbwDwJ3f1zOKTSU6PkIeqovo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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