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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836eb6df50151ec5cd76468a828ab808b1043532a6f7b630a3662d40460f0931' 
  AND token = 'TyUksuUGFTbDJWIsWAxYYk4wUyXUt+VAxGSJjubSasI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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