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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163c6a36e1bbab9ae6e7c88e50353240e6c23d2a8523b668562403048caa3702' 
  AND token = 'zLnnEJTFlDoIokgP0EAYYo2j7K5Hq9kEmQtArZCiTZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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